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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthortony
    • CommentTimeMay 19th 2019
    The chimney will get damp and so needs ventilating, most people allow heat from the house to escape up their disused floes and out if the pots, this keeps the chimney dry but wastes a LOT of heat. In your case I am recommending filling your flues with beads and ventilating the remaining top part of the flue with the air bricks, this can be done from within the loft if you have one.
    Posted By: KBabs The chimneys have been EWI'd and rendered so cannot add additional airbricks.

    If it is a cavity wall then I would expect the chimney to be on the inner leaf, otherwise in any event I would be putting air bricks on the inside in the loft. If the loft has been built in there is usually a small space above the ceiling (that should be provided with access) and it is here that the air brick would go, above the insulation.
    • CommentAuthorKBabs
    • CommentTimeMay 20th 2019
    I cannot access the chimney from the loft, unfortunately.
    • CommentAuthorKBabs
    • CommentTimeMay 20th 2019
    The chimney is part of the old 9" wall house
    OK If the chimney is on an old 9" wall and you can not access it from the loft then the only way to provide ventilation would be from the outside.
    As Tony suggested fill the chimney with beads, care has to be taken to make sure that the beads flow around any bends in the flue, to a level to the top of the loft insulation by guesstimate or measurement and then provide ventilation from the outside at a point just above the loft insulation by drilling through the EWI and the wall to the flue. I would have thought a 30 - 40mm hole would be ample and once done then fit a fly screen in the hole to keep nesting birds etc. out and here a round soffit vent would probably fit the bill.

    Whilst this hole will give a cold bridge you will already have a cold bridge from the inside of the gable end (above the insulation level) which I presume is not insulated and this won't add much to what is already there.
    • CommentAuthorKBabs
    • CommentTimeJun 18th 2019

    I have filled the chimney with the eps balls to approx. the ceiling height. From the top of the eps ball to the top of the chimney pot is 7-8feet. The two pots have cowls on top, so are well protected from rain entering them. With he 7-8 foot void about the eps balls, is there not enough ventilation through the chimney post, negating the need for additional ventilation? If it helps, the chimney is built on the outs of the house, not inside.
    • CommentAuthortony
    • CommentTimeJun 18th 2019
    No, I would like to ventilation from roughly the bottom of the flue that remains above the beads but you could try your ideas and let us know if there are problems, I have both had them and seen them
    Wot tony said +1

    fill with the beads to the ceiling level, make sure the cowls really are rain proof and wait for problems. If they occur then ventilate from the outside as I suggested above.
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